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An experimental and crystal plasticity simulation study on kink band-assisted grain fragmentation during high-pressure torsion of (CrFeNi)99Si1 medium-entropy alloy

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Abstract

The current research addresses the kink band-assisted grain fragmentation of (CrFeNi)99Si1 medium-entropy alloy during high-pressure torsion (HPT) using combinatorial experimental and crystal plasticity simulations approach. The HPT experiments were carried out at room temperature with a pressure of 6 GPa for 0.2, 0.5, 1, 2, and 5 turns to achieve different levels of shear strain followed by detailed microstructural characterization using electron backscatter diffraction, transmission electron microscopy, and nanoindentation. Microstructural characterization at different length scales shows the fragmentation of grains aided by the formation of kink bands due to the activation of {111} \(<10\overline{1 }>\) and {111} \(<11\overline{2 }>\) slip system followed by gradual conversion of low-angle grain boundaries to high-angle grain boundaries by continuous dynamic recrystallization (cDRX) observed in medium and low stacking fault energy FCC metals and alloys. This aforementioned mechanism occurs over a range of length scales, scaling down the grain size over three orders of magnitude from 40 ± 5 μm to 35 ± 3 nm. Crystal plasticity simulations using the fast Fourier transform solver were employed for full-field simulations to capture the process of kink band-assisted grain fragmentation using the open-source Dusseldorf advanced material simulation kit (DAMASK) software. Finally, constitutive strength equations were developed to quantitatively predict the evolution of strength as a function of HPT deformation to establish the processing-microstructure-mechanical property in (CrFeNi)99Si1 medium-entropy alloy.

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Acknowledgements

The authors would like to thank Prof. Praveen Kumar, Materials Engineering, Indian Institute of Science, Bangalore, India, for providing access to HPT facility and Mr. Deepak Paliwal for help with the HPT experiments. The authors also acknowledge funding received from the Department of Science and Technology, Government of India, through the Science and Engineering Research Board and the Indian Space Research Organization for research on high-entropy alloys.

Funding

This authors funded by Vikram Sarabhai Space Centre (STC /MET /2019437), DST-SERB (EMR/2016/007831).

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  1. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Swati Mahato, Shirish Chandrakar, Krishanu Biswas & Nilesh P. Gurao

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Contributions

SM was involved in data curation, methodology, formal analysis, conceptualization, writing—original draft. SC contributed to data curation, software, conceptualization, writing—original draft. KB helped in conceptualization, resources, supervision, writing—review & editing. NPG was involved in conceptualization, resources, supervision, writing—review & editing.

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Correspondence to Krishanu Biswas or Nilesh P. Gurao.

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Mahato, S., Chandrakar, S., Biswas, K. et al. An experimental and crystal plasticity simulation study on kink band-assisted grain fragmentation during high-pressure torsion of (CrFeNi)99Si1 medium-entropy alloy. J Mater Sci 59, 6075–6096 (2024). https://doi.org/10.1007/s10853-023-09224-6

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